Reviewed by The Wellness Team. Last reviewed October 2026.
Fungal nail infection is one of the most common nail problems in the UK, and one of the most stubborn. It will not clear on its own, and the longer it is left, the harder it is to treat. This guide explains how to spot it, which treatments actually work, and when to see a doctor.
What fungal nail infection looks like
A fungal nail infection usually starts at the edge of one nail, often a toenail, and spreads slowly. The nail turns white, yellow or brown, thickens, and becomes crumbly or brittle. It may lift away from the nail bed, and there is sometimes a slightly musty smell. It is usually painless at first, which is why so many people leave it for months or years.
It often arrives alongside athlete's foot, because the same fungi cause both. Warm, damp conditions help it spread: communal changing rooms, sweaty trainers, and shared nail tools are common routes.
Why it is worth treating properly
Left alone, the infection rarely stays cosmetic. Thickened nails can become painful in shoes, the infection can spread to other nails and to the skin, and it can pass to other people in the household. For anyone with diabetes or poor circulation, an untreated fungal nail raises the risk of more serious foot problems, which is why prompt treatment matters more in those groups.
There is also a diagnostic point that surprises people: not every thickened, discoloured nail is fungal. Psoriasis, trauma and eczema can look similar, and treating the wrong condition wastes months. A GP can confirm the diagnosis before treatment starts, sometimes with a simple nail clipping sent to the lab.
Which treatments actually work
This is where expectations need to be honest, because the cupboard remedies mostly do not work. Pharmacy paints and home treatments can help very early, mild infections at the nail edge, but once the infection is established under the nail plate, creams and oils cannot reach it in useful concentrations.
Prescription antifungal tablets are the most effective treatment for an established infection. They work from the bloodstream into the growing nail, and a course typically lasts several weeks for fingernails and several months for toenails, because the infected nail has to grow out. A GP will check that the tablets are suitable for you, review your other medicines, and arrange liver function blood tests where indicated. Medicated nail lacquers are an option for milder cases or when tablets are not suitable.
Whatever the treatment, the visible nail only looks better as fresh nail grows through, so judge progress in months, not weeks. Finishing the full course matters: stopping early is the main reason infections come back.
How to stop it coming back
Keep feet dry, change socks daily, and rotate shoes so pairs dry out between wears. Treat athlete's foot at the same time, or the nails will be reinfected. Wear flip-flops in communal showers and changing rooms, do not share nail clippers or towels, and disinfect or replace old shoes if the infection was long-standing.
To book or ask a question, message WhatsApp or call 020 3951 3429. A telephone appointment is £59, a video consultation is £150, and an in-person visit at our London clinic is £220. A video appointment works well for nail problems: you can show the nail on camera or send clear photos, and the GP can prescribe where clinically appropriate and arrange any nail clippings or blood tests needed.
Questions people ask
Can I get antifungal tablets without seeing a doctor?
No. Oral antifungals are prescription-only in the UK, because they are not suitable for everyone and can interact with other medicines. A video consultation is usually enough for a GP to assess the nail, confirm the likely diagnosis and prescribe where clinically appropriate.
How long does fungal nail treatment take to work?
The tablets work within weeks, but the nail only looks normal once healthy nail has grown through. Fingernails take around three to six months; a big toenail can take twelve months or more. Early improvement at the base of the nail is the sign to look for.
Do home remedies like vinegar or tea tree oil work?
There is no good evidence that home remedies clear an established fungal nail infection. They are safe to try for a very early case, but if the nail is thickening or the infection is spreading, prescription treatment is far more reliable and saves months of frustration.
Can fungal nail spread to other people?
Yes, though it spreads slowly. It passes through shared floors, shoes, towels and nail tools. Treating the infection, and any athlete's foot with it, protects the rest of the household.
If a nail has been discoloured or thickening for more than a few weeks, get it looked at properly. Message us on WhatsApp, call 020 3951 3429, or email team@thewellnesslondon.com. Same-day appointments are often available.